Slide-valve internal-combustion engine.



A. ALLTREE.

SLIDE VALVE INTERNAL COMBUSTIDN ENGINE.

Patented Apr. 9, 1918.

4 SHEETS-SHEET I APPLICATION FILED MAR.3I, 1915. Ilplc,

A. ALLTREE.

SLIDE VALVE lNTERNAL CO'MBUSTION ENGINE.

APPLICATlON FlLED MAR. 3l i915.

Patented Apr. 9, 1918.

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A. ALLTREE.

ISLIDE VALVE LNTERNAL COMBUSTION ENGINE.

APPLICATION FILED MAH. 3]-1915- A. ALLTREE.

SLIDE VALVE INTERNAL COMBUSTION ENGINE.

APPLlcATIoN FILED MAR. s, |915.

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SLIDE-VALVE INTERNAL-COMBUSTION ENGINE.

Specification of Letters Patent.

Patented Apr. 9, 1918..

Application filed March 31, 1915. Serial No. 18,246.

To all whom t may concern.:

Be it known that I, ARTHUR ALpTnEE, a subject of the King of England, residlng at 279 Tilmslow road, Fallowiield, Manchester,

in the county of Lancaster, England, engineer, have invented certainnew and useful Improvements in or Relating to Slide-Valve Internal-Combustion Engines, of which the following is a specification.

M v invention relates to improvements in tour-stroke cycle internal combustion engines, ot' the type in which the inlet and exhaust ports of the cylinder are controlled by separate segmental or half-cylindrical slide valves. so arranged that each valve operates on both its upstroke and its downstroke.

I will further describe my invention with the aid of the accompanying sheets of explanatory drawings, in which:-

Figure 1 is a longitudinal section of a water cooled engine, and

Fig. Q is an elevation, partly in section.

Fig. 3 is a side elevation of the base of the cylinder and the lower end of the valve cover.

Fig. Je is a sectional plan showing the valves, valve cover, and vertical flanges.

Fig. 5 is an elevation, partly in Section, showing the application ot the invention to a single cylinder engine.

In the several views like characters of refcrence denote like or equivalent parts Wherever they occur.

Referring to the drawings, but first more particularly to Figs. 1 to 4, 1 indicates a stationary water cooled cylinder, formed with a base or flange 1a in which are provided passages or channels 1l leadingk to the Waterjacket 1c. The lower end 1d of said cylinder 1 may project into the crank chamber 2 if a short water jacket is required.

Said cylinder 1 is provided with an inlet port 1e and an exhaust port l.

A broad groove is formed around said cylinder 1 to accommodate the broad ring 3 which is formed with inlet and exhaust ports t3 3l Fig. Q) corresponding with those in the cylinder. Said ring 3 may be made in two parts and the ends stepped or otherwise joined together, as shown in Fig. 2 in which a ring is shown in elevation, and valves 6 and 7 hereinafter referred to partly in section at 3c, or, alternatively, the ring may be a. single piece. In either case the ring is free' to expand.

A narrower groove is also out in said cylinder 1 above the ports to accommodate the expansion ring l, and a similar groove and ring 5 are provided below the ports, the 9bject of said rings et and 5 being to expand ring 3 and to prevent leakage of the gases by way of the back of said ring.

The inlet valve 6 and the exhaust valve 7 lit around cylinder 1. Said valves may be formed by cutting a cylindrical sleeve in two vertical halves, each half forming one valve. Alternatively the valves may be made of sheet steel o1' other metal suitably pressed to shape. Each valve is provided with a port 6a and 7a respectively. The inlet valve 6 is formed with a lug 6l to which one end ot' the connecting rod 8 is pivoted, said rod being driven by the quarter-time valve-shaft 9. Similarly, the exhaust valve 7 is formed with a lug 7*- and connected by the rod 10 to the quarter-time valve-shaft 11.

A valve cover 12 lits over the valves, said cover being provided with an inlet passage 12a and an exhaust passage 12b. The lower end of the cover is provided with vertical flanges 12 between which t-he inlet valve lug 6" fits and is free to slide, and similar flanges 12d are provided to accommodate the exhaust valve lug 7b, this arrangement preventing any tendency of the valves to turn around the cylinder. As a means of taking up wear, either flange may be formed with an adjustable piece, or if preferred the lug 6l may beso provided. Said flanges may be integral with the cover 12 or. suitably secured thereto. Covers 121, 1Ql may be fitted over the flanges.

Said valves are lubricated by admittlng oil through pipe 12e to the groove l2f.

The valve-shafts are driven from the engine shafts 13 through the medium of the worm gears 14, 15, 16, 17, 18 and 19 and the cross-shaft 20. Alternatively, any suitably form of toothed or chain gearing may be employed for this purpose.

The travel of each valve is such that its port is moved alternatively over the upper and lower parts of the broad rmg the valve port registering with the cyhnder port on both its upstroke and. its .downstroke. The result of this motion .1s that the ports are opened and closed during the most rapid part of the valve movement and also that during compression and firing the valves are almost stationary as they are then traversing their dead centers.

As shown in Fig. 1 the piston 21 is at the end of its working stroke and the exhaust valve 7 (on its up-stroke) has begun to register with the exhaust port 1f .for the exhaust stroke. It will be seen that the maximum port opening vwill coincide with thev greatest speed of the piston, while the angle of the valve shaft crank will make it clear that the opening and closing of the portl will be rapid. y

As the valves are positively driven the port opening and closing is exact at al1 speeds.

During compression and iiring the valve ports are effectively sealed Iby the ring 3 on inside and by the pressure of the valves against the cover 12 on the outside. Said ring 3 also prevents leakage by way 0f the valve joints-fthe minute division between the edges of the valves.- As hereinbefore mentioned said expansion rings 4 and 5 prevent leakage by way of the back of the broad one side, and lugs 6", 7b are disposed centrally and connected to the quarter-time .valve shaft 22 which is driven through worm or like gearing 23, 24. Flanges 12c 12d are provided in the vcover 12 to accommodate both lugs 6b 71?.

Having now described'my invention what I claim as new and desire to secure by Letters Patent is 1. In a four-stroke cycle internal combustion engine, the comibination with the working cylinder'of a compression-holding ring, its ends Ibeing suitably joined together, inlet and exhaust ports corresponding with those of .said working cylinder provided in said ring, two or more expansion rings arranged on, the ba'ck of said compression-holding ring, separate segmental or half-'cylindrical slide valves arranged to operate on both their upstroke and downstroke, a valve cover, lugs .formed on said valves, and flanges on sald cover adapted to act as guides `for said valve lu s.

In a four-stroke cycle internal combustion engine, the combination with the working cylinder of a compression-holding ring formed in one or two parts, its ends being suitably joined together, inlet and exhaust ports corresponding with those 0f said working cylinder provided in said ring, two or more expansion rings arranged on the back of said `compression-holding ring, 'separate segmental or half-cylindrical slide valves arranged to operate on both their-up-stroke and down-stroke, lugs formed on said valve, a valvecover and flanges on said cover adapted to actV as guides for said valve lugs, a.

water jacket and a base or ange formed on the working cylinder, and water channels communicating with said jacket formed in said base or ange.

In testimony whereof I ax my signature 4 in the presence of two witnesses.

ARTHUR ALLTREE.

Witnesses H. WILLIAMS, J. MeCoRMICK. 4 

